let flag = false
function showOrHide(){
	flag = !flag
	if(flag){
		document.getElementsByClassName('dropdown')[0].style.display = "block"
	}else{
		document.getElementsByClassName('dropdown')[0].style.display = "none"
	}
}
function scrollO(){
	document.documentElement.scrollTop = 0
}
window.onscroll = function(){
	if(document.documentElement.scrollTop!=0){
		document.getElementsByClassName("scrollup")[0].style.display = "block"
	}else{
		document.getElementsByClassName("scrollup")[0].style.display = "none"
	}
}